package snippets;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ControlEditor;
import org.eclipse.swt.custom.TableCursor;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.events.KeyAdapter;

public class TableCursorTest {
	  public static void main(String[] args) {
			Display display = new Display();
			Shell shell = new Shell(display);
			shell.setLayout(new GridLayout());
		
			// create a a table with 3 columns and fill with data
			final Table table = new Table(shell, SWT.BORDER | SWT.MULTI | SWT.FULL_SELECTION);
			table.setLayoutData(new GridData(GridData.FILL_BOTH));
			TableColumn column1 = new TableColumn(table, SWT.NONE);
			TableColumn column2 = new TableColumn(table, SWT.NONE);
			TableColumn column3 = new TableColumn(table, SWT.NONE);
			for (int i = 0; i < 10; i++) {
				TableItem item = new TableItem(table, SWT.NONE);
				item.setText(new String[] { "cell "+i+" 0", "cell "+i+" 1", "cell "+i+" 2"});
			}
			column1.pack();
			column2.pack();
			column3.pack();
		
			// create a TableCursor to navigate around the table
			final TableCursor cursor = new TableCursor(table, SWT.NONE);
			// create an editor to edit the cell when the user hits "ENTER" 
			// while over a cell in the table
			final ControlEditor editor = new ControlEditor(cursor);
			editor.grabHorizontal = true;
			editor.grabVertical = true;
		
			cursor.addSelectionListener(new SelectionAdapter() {
				// when the TableEditor is over a cell, select the corresponding row in 
				// the table
				public void widgetSelected(SelectionEvent e) {
					table.setSelection(new TableItem[] {cursor.getRow()});
				}
				// when the user hits "ENTER" in the TableCursor, pop up a text editor so that 
				// they can change the text of the cell
				public void widgetDefaultSelected(SelectionEvent e){
					final Text text = new Text(cursor, SWT.NONE);
					TableItem row = cursor.getRow();
					int column = cursor.getColumn();
					text.setText(row.getText(column));
					text.addKeyListener(new KeyAdapter() {
						public void keyPressed(KeyEvent e) {
							// close the text editor and copy the data over 
							// when the user hits "ENTER"
							if (e.character == SWT.CR) {
								TableItem row = cursor.getRow();
								int column = cursor.getColumn();
								row.setText(column, text.getText());
								text.dispose();
							}
							// close the text editor when the user hits "ESC"
							if (e.character == SWT.ESC) {
								text.dispose();
							}
						}
					});
					editor.setEditor(text);
					text.setFocus();
				}
			});
			// Hide the TableCursor when the user hits the "MOD1" or "MOD2" key.
			// This allows the user to select multiple items in the table.
			cursor.addKeyListener(new KeyAdapter() {
				public void keyPressed(KeyEvent e) {
					if (e.keyCode == SWT.MOD1 || 
					    e.keyCode == SWT.MOD2 || 
					    (e.stateMask & SWT.MOD1) != 0 || 
					    (e.stateMask & SWT.MOD2) != 0) {
						cursor.setVisible(false);
					}
				}
			});
			// Show the TableCursor when the user releases the "MOD2" or "MOD1" key.
			// This signals the end of the multiple selection task.
			table.addKeyListener(new KeyAdapter() {
				public void keyReleased(KeyEvent e) {
					if (e.keyCode == SWT.MOD1 && (e.stateMask & SWT.MOD2) != 0) return;
					if (e.keyCode == SWT.MOD2 && (e.stateMask & SWT.MOD1) != 0) return;
					if (e.keyCode != SWT.MOD1 && (e.stateMask & SWT.MOD1) != 0) return;
					if (e.keyCode != SWT.MOD2 && (e.stateMask & SWT.MOD2) != 0) return;
				
					TableItem[] selection = table.getSelection();
					TableItem row = (selection.length == 0) ? table.getItem(table.getTopIndex()) : selection[0];
					table.showItem(row);
					cursor.setSelection(row, 0);
					cursor.setVisible(true);
					cursor.setFocus();
				}
			});
		
			shell.open();
			while (!shell.isDisposed()) {
				if (!display.readAndDispatch())
					display.sleep();
			}
			display.dispose();
		}
	 
}
